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Merge tag 'firewire-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394...
[deliverable/linux.git] / drivers / usb / serial / digi_acceleport.c
1 /*
2 * Digi AccelePort USB-4 and USB-2 Serial Converters
3 *
4 * Copyright 2000 by Digi International
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * Shamelessly based on Brian Warner's keyspan_pda.c and Greg Kroah-Hartman's
12 * usb-serial driver.
13 *
14 * Peter Berger (pberger@brimson.com)
15 * Al Borchers (borchers@steinerpoint.com)
16 */
17
18 #include <linux/kernel.h>
19 #include <linux/errno.h>
20 #include <linux/init.h>
21 #include <linux/slab.h>
22 #include <linux/tty.h>
23 #include <linux/tty_driver.h>
24 #include <linux/tty_flip.h>
25 #include <linux/module.h>
26 #include <linux/spinlock.h>
27 #include <linux/workqueue.h>
28 #include <linux/uaccess.h>
29 #include <linux/usb.h>
30 #include <linux/wait.h>
31 #include <linux/usb/serial.h>
32
33 /* Defines */
34
35 /*
36 * Version Information
37 */
38 #define DRIVER_VERSION "v1.80.1.2"
39 #define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>"
40 #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver"
41
42 /* port output buffer length -- must be <= transfer buffer length - 2 */
43 /* so we can be sure to send the full buffer in one urb */
44 #define DIGI_OUT_BUF_SIZE 8
45
46 /* port input buffer length -- must be >= transfer buffer length - 3 */
47 /* so we can be sure to hold at least one full buffer from one urb */
48 #define DIGI_IN_BUF_SIZE 64
49
50 /* retry timeout while sleeping */
51 #define DIGI_RETRY_TIMEOUT (HZ/10)
52
53 /* timeout while waiting for tty output to drain in close */
54 /* this delay is used twice in close, so the total delay could */
55 /* be twice this value */
56 #define DIGI_CLOSE_TIMEOUT (5*HZ)
57
58
59 /* AccelePort USB Defines */
60
61 /* ids */
62 #define DIGI_VENDOR_ID 0x05c5
63 #define DIGI_2_ID 0x0002 /* USB-2 */
64 #define DIGI_4_ID 0x0004 /* USB-4 */
65
66 /* commands
67 * "INB": can be used on the in-band endpoint
68 * "OOB": can be used on the out-of-band endpoint
69 */
70 #define DIGI_CMD_SET_BAUD_RATE 0 /* INB, OOB */
71 #define DIGI_CMD_SET_WORD_SIZE 1 /* INB, OOB */
72 #define DIGI_CMD_SET_PARITY 2 /* INB, OOB */
73 #define DIGI_CMD_SET_STOP_BITS 3 /* INB, OOB */
74 #define DIGI_CMD_SET_INPUT_FLOW_CONTROL 4 /* INB, OOB */
75 #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL 5 /* INB, OOB */
76 #define DIGI_CMD_SET_DTR_SIGNAL 6 /* INB, OOB */
77 #define DIGI_CMD_SET_RTS_SIGNAL 7 /* INB, OOB */
78 #define DIGI_CMD_READ_INPUT_SIGNALS 8 /* OOB */
79 #define DIGI_CMD_IFLUSH_FIFO 9 /* OOB */
80 #define DIGI_CMD_RECEIVE_ENABLE 10 /* INB, OOB */
81 #define DIGI_CMD_BREAK_CONTROL 11 /* INB, OOB */
82 #define DIGI_CMD_LOCAL_LOOPBACK 12 /* INB, OOB */
83 #define DIGI_CMD_TRANSMIT_IDLE 13 /* INB, OOB */
84 #define DIGI_CMD_READ_UART_REGISTER 14 /* OOB */
85 #define DIGI_CMD_WRITE_UART_REGISTER 15 /* INB, OOB */
86 #define DIGI_CMD_AND_UART_REGISTER 16 /* INB, OOB */
87 #define DIGI_CMD_OR_UART_REGISTER 17 /* INB, OOB */
88 #define DIGI_CMD_SEND_DATA 18 /* INB */
89 #define DIGI_CMD_RECEIVE_DATA 19 /* INB */
90 #define DIGI_CMD_RECEIVE_DISABLE 20 /* INB */
91 #define DIGI_CMD_GET_PORT_TYPE 21 /* OOB */
92
93 /* baud rates */
94 #define DIGI_BAUD_50 0
95 #define DIGI_BAUD_75 1
96 #define DIGI_BAUD_110 2
97 #define DIGI_BAUD_150 3
98 #define DIGI_BAUD_200 4
99 #define DIGI_BAUD_300 5
100 #define DIGI_BAUD_600 6
101 #define DIGI_BAUD_1200 7
102 #define DIGI_BAUD_1800 8
103 #define DIGI_BAUD_2400 9
104 #define DIGI_BAUD_4800 10
105 #define DIGI_BAUD_7200 11
106 #define DIGI_BAUD_9600 12
107 #define DIGI_BAUD_14400 13
108 #define DIGI_BAUD_19200 14
109 #define DIGI_BAUD_28800 15
110 #define DIGI_BAUD_38400 16
111 #define DIGI_BAUD_57600 17
112 #define DIGI_BAUD_76800 18
113 #define DIGI_BAUD_115200 19
114 #define DIGI_BAUD_153600 20
115 #define DIGI_BAUD_230400 21
116 #define DIGI_BAUD_460800 22
117
118 /* arguments */
119 #define DIGI_WORD_SIZE_5 0
120 #define DIGI_WORD_SIZE_6 1
121 #define DIGI_WORD_SIZE_7 2
122 #define DIGI_WORD_SIZE_8 3
123
124 #define DIGI_PARITY_NONE 0
125 #define DIGI_PARITY_ODD 1
126 #define DIGI_PARITY_EVEN 2
127 #define DIGI_PARITY_MARK 3
128 #define DIGI_PARITY_SPACE 4
129
130 #define DIGI_STOP_BITS_1 0
131 #define DIGI_STOP_BITS_2 1
132
133 #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF 1
134 #define DIGI_INPUT_FLOW_CONTROL_RTS 2
135 #define DIGI_INPUT_FLOW_CONTROL_DTR 4
136
137 #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF 1
138 #define DIGI_OUTPUT_FLOW_CONTROL_CTS 2
139 #define DIGI_OUTPUT_FLOW_CONTROL_DSR 4
140
141 #define DIGI_DTR_INACTIVE 0
142 #define DIGI_DTR_ACTIVE 1
143 #define DIGI_DTR_INPUT_FLOW_CONTROL 2
144
145 #define DIGI_RTS_INACTIVE 0
146 #define DIGI_RTS_ACTIVE 1
147 #define DIGI_RTS_INPUT_FLOW_CONTROL 2
148 #define DIGI_RTS_TOGGLE 3
149
150 #define DIGI_FLUSH_TX 1
151 #define DIGI_FLUSH_RX 2
152 #define DIGI_RESUME_TX 4 /* clears xoff condition */
153
154 #define DIGI_TRANSMIT_NOT_IDLE 0
155 #define DIGI_TRANSMIT_IDLE 1
156
157 #define DIGI_DISABLE 0
158 #define DIGI_ENABLE 1
159
160 #define DIGI_DEASSERT 0
161 #define DIGI_ASSERT 1
162
163 /* in band status codes */
164 #define DIGI_OVERRUN_ERROR 4
165 #define DIGI_PARITY_ERROR 8
166 #define DIGI_FRAMING_ERROR 16
167 #define DIGI_BREAK_ERROR 32
168
169 /* out of band status */
170 #define DIGI_NO_ERROR 0
171 #define DIGI_BAD_FIRST_PARAMETER 1
172 #define DIGI_BAD_SECOND_PARAMETER 2
173 #define DIGI_INVALID_LINE 3
174 #define DIGI_INVALID_OPCODE 4
175
176 /* input signals */
177 #define DIGI_READ_INPUT_SIGNALS_SLOT 1
178 #define DIGI_READ_INPUT_SIGNALS_ERR 2
179 #define DIGI_READ_INPUT_SIGNALS_BUSY 4
180 #define DIGI_READ_INPUT_SIGNALS_PE 8
181 #define DIGI_READ_INPUT_SIGNALS_CTS 16
182 #define DIGI_READ_INPUT_SIGNALS_DSR 32
183 #define DIGI_READ_INPUT_SIGNALS_RI 64
184 #define DIGI_READ_INPUT_SIGNALS_DCD 128
185
186
187 /* Structures */
188
189 struct digi_serial {
190 spinlock_t ds_serial_lock;
191 struct usb_serial_port *ds_oob_port; /* out-of-band port */
192 int ds_oob_port_num; /* index of out-of-band port */
193 int ds_device_started;
194 };
195
196 struct digi_port {
197 spinlock_t dp_port_lock;
198 int dp_port_num;
199 int dp_out_buf_len;
200 unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE];
201 int dp_write_urb_in_use;
202 unsigned int dp_modem_signals;
203 wait_queue_head_t dp_modem_change_wait;
204 int dp_transmit_idle;
205 wait_queue_head_t dp_transmit_idle_wait;
206 int dp_throttled;
207 int dp_throttle_restart;
208 wait_queue_head_t dp_flush_wait;
209 wait_queue_head_t dp_close_wait; /* wait queue for close */
210 struct work_struct dp_wakeup_work;
211 struct usb_serial_port *dp_port;
212 };
213
214
215 /* Local Function Declarations */
216
217 static void digi_wakeup_write(struct usb_serial_port *port);
218 static void digi_wakeup_write_lock(struct work_struct *work);
219 static int digi_write_oob_command(struct usb_serial_port *port,
220 unsigned char *buf, int count, int interruptible);
221 static int digi_write_inb_command(struct usb_serial_port *port,
222 unsigned char *buf, int count, unsigned long timeout);
223 static int digi_set_modem_signals(struct usb_serial_port *port,
224 unsigned int modem_signals, int interruptible);
225 static int digi_transmit_idle(struct usb_serial_port *port,
226 unsigned long timeout);
227 static void digi_rx_throttle(struct tty_struct *tty);
228 static void digi_rx_unthrottle(struct tty_struct *tty);
229 static void digi_set_termios(struct tty_struct *tty,
230 struct usb_serial_port *port, struct ktermios *old_termios);
231 static void digi_break_ctl(struct tty_struct *tty, int break_state);
232 static int digi_tiocmget(struct tty_struct *tty);
233 static int digi_tiocmset(struct tty_struct *tty, unsigned int set,
234 unsigned int clear);
235 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
236 const unsigned char *buf, int count);
237 static void digi_write_bulk_callback(struct urb *urb);
238 static int digi_write_room(struct tty_struct *tty);
239 static int digi_chars_in_buffer(struct tty_struct *tty);
240 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port);
241 static void digi_close(struct usb_serial_port *port);
242 static void digi_dtr_rts(struct usb_serial_port *port, int on);
243 static int digi_startup_device(struct usb_serial *serial);
244 static int digi_startup(struct usb_serial *serial);
245 static void digi_disconnect(struct usb_serial *serial);
246 static void digi_release(struct usb_serial *serial);
247 static void digi_read_bulk_callback(struct urb *urb);
248 static int digi_read_inb_callback(struct urb *urb);
249 static int digi_read_oob_callback(struct urb *urb);
250
251
252 static const struct usb_device_id id_table_combined[] = {
253 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
254 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
255 { } /* Terminating entry */
256 };
257
258 static const struct usb_device_id id_table_2[] = {
259 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
260 { } /* Terminating entry */
261 };
262
263 static const struct usb_device_id id_table_4[] = {
264 { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
265 { } /* Terminating entry */
266 };
267
268 MODULE_DEVICE_TABLE(usb, id_table_combined);
269
270 /* device info needed for the Digi serial converter */
271
272 static struct usb_serial_driver digi_acceleport_2_device = {
273 .driver = {
274 .owner = THIS_MODULE,
275 .name = "digi_2",
276 },
277 .description = "Digi 2 port USB adapter",
278 .id_table = id_table_2,
279 .num_ports = 3,
280 .open = digi_open,
281 .close = digi_close,
282 .dtr_rts = digi_dtr_rts,
283 .write = digi_write,
284 .write_room = digi_write_room,
285 .write_bulk_callback = digi_write_bulk_callback,
286 .read_bulk_callback = digi_read_bulk_callback,
287 .chars_in_buffer = digi_chars_in_buffer,
288 .throttle = digi_rx_throttle,
289 .unthrottle = digi_rx_unthrottle,
290 .set_termios = digi_set_termios,
291 .break_ctl = digi_break_ctl,
292 .tiocmget = digi_tiocmget,
293 .tiocmset = digi_tiocmset,
294 .attach = digi_startup,
295 .disconnect = digi_disconnect,
296 .release = digi_release,
297 };
298
299 static struct usb_serial_driver digi_acceleport_4_device = {
300 .driver = {
301 .owner = THIS_MODULE,
302 .name = "digi_4",
303 },
304 .description = "Digi 4 port USB adapter",
305 .id_table = id_table_4,
306 .num_ports = 4,
307 .open = digi_open,
308 .close = digi_close,
309 .write = digi_write,
310 .write_room = digi_write_room,
311 .write_bulk_callback = digi_write_bulk_callback,
312 .read_bulk_callback = digi_read_bulk_callback,
313 .chars_in_buffer = digi_chars_in_buffer,
314 .throttle = digi_rx_throttle,
315 .unthrottle = digi_rx_unthrottle,
316 .set_termios = digi_set_termios,
317 .break_ctl = digi_break_ctl,
318 .tiocmget = digi_tiocmget,
319 .tiocmset = digi_tiocmset,
320 .attach = digi_startup,
321 .disconnect = digi_disconnect,
322 .release = digi_release,
323 };
324
325 static struct usb_serial_driver * const serial_drivers[] = {
326 &digi_acceleport_2_device, &digi_acceleport_4_device, NULL
327 };
328
329 /* Functions */
330
331 /*
332 * Cond Wait Interruptible Timeout Irqrestore
333 *
334 * Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
335 * so that wake ups are not lost if they occur between the unlock
336 * and the sleep. In other words, spin_unlock_irqrestore and
337 * interruptible_sleep_on_timeout are "atomic" with respect to
338 * wake ups. This is used to implement condition variables.
339 *
340 * interruptible_sleep_on_timeout is deprecated and has been replaced
341 * with the equivalent code.
342 */
343
344 static long cond_wait_interruptible_timeout_irqrestore(
345 wait_queue_head_t *q, long timeout,
346 spinlock_t *lock, unsigned long flags)
347 __releases(lock)
348 {
349 DEFINE_WAIT(wait);
350
351 prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE);
352 spin_unlock_irqrestore(lock, flags);
353 timeout = schedule_timeout(timeout);
354 finish_wait(q, &wait);
355
356 return timeout;
357 }
358
359
360 /*
361 * Digi Wakeup Write
362 *
363 * Wake up port, line discipline, and tty processes sleeping
364 * on writes.
365 */
366
367 static void digi_wakeup_write_lock(struct work_struct *work)
368 {
369 struct digi_port *priv =
370 container_of(work, struct digi_port, dp_wakeup_work);
371 struct usb_serial_port *port = priv->dp_port;
372 unsigned long flags;
373
374 spin_lock_irqsave(&priv->dp_port_lock, flags);
375 digi_wakeup_write(port);
376 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
377 }
378
379 static void digi_wakeup_write(struct usb_serial_port *port)
380 {
381 struct tty_struct *tty = tty_port_tty_get(&port->port);
382 if (tty) {
383 tty_wakeup(tty);
384 tty_kref_put(tty);
385 }
386 }
387
388
389 /*
390 * Digi Write OOB Command
391 *
392 * Write commands on the out of band port. Commands are 4
393 * bytes each, multiple commands can be sent at once, and
394 * no command will be split across USB packets. Returns 0
395 * if successful, -EINTR if interrupted while sleeping and
396 * the interruptible flag is true, or a negative error
397 * returned by usb_submit_urb.
398 */
399
400 static int digi_write_oob_command(struct usb_serial_port *port,
401 unsigned char *buf, int count, int interruptible)
402 {
403 int ret = 0;
404 int len;
405 struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
406 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
407 unsigned long flags = 0;
408
409 dev_dbg(&port->dev,
410 "digi_write_oob_command: TOP: port=%d, count=%d\n",
411 oob_priv->dp_port_num, count);
412
413 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
414 while (count > 0) {
415 while (oob_priv->dp_write_urb_in_use) {
416 cond_wait_interruptible_timeout_irqrestore(
417 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
418 &oob_priv->dp_port_lock, flags);
419 if (interruptible && signal_pending(current))
420 return -EINTR;
421 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
422 }
423
424 /* len must be a multiple of 4, so commands are not split */
425 len = min(count, oob_port->bulk_out_size);
426 if (len > 4)
427 len &= ~3;
428 memcpy(oob_port->write_urb->transfer_buffer, buf, len);
429 oob_port->write_urb->transfer_buffer_length = len;
430 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
431 if (ret == 0) {
432 oob_priv->dp_write_urb_in_use = 1;
433 count -= len;
434 buf += len;
435 }
436 }
437 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
438 if (ret)
439 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
440 __func__, ret);
441 return ret;
442
443 }
444
445
446 /*
447 * Digi Write In Band Command
448 *
449 * Write commands on the given port. Commands are 4
450 * bytes each, multiple commands can be sent at once, and
451 * no command will be split across USB packets. If timeout
452 * is non-zero, write in band command will return after
453 * waiting unsuccessfully for the URB status to clear for
454 * timeout ticks. Returns 0 if successful, or a negative
455 * error returned by digi_write.
456 */
457
458 static int digi_write_inb_command(struct usb_serial_port *port,
459 unsigned char *buf, int count, unsigned long timeout)
460 {
461 int ret = 0;
462 int len;
463 struct digi_port *priv = usb_get_serial_port_data(port);
464 unsigned char *data = port->write_urb->transfer_buffer;
465 unsigned long flags = 0;
466
467 dev_dbg(&port->dev, "digi_write_inb_command: TOP: port=%d, count=%d\n",
468 priv->dp_port_num, count);
469
470 if (timeout)
471 timeout += jiffies;
472 else
473 timeout = ULONG_MAX;
474
475 spin_lock_irqsave(&priv->dp_port_lock, flags);
476 while (count > 0 && ret == 0) {
477 while (priv->dp_write_urb_in_use &&
478 time_before(jiffies, timeout)) {
479 cond_wait_interruptible_timeout_irqrestore(
480 &port->write_wait, DIGI_RETRY_TIMEOUT,
481 &priv->dp_port_lock, flags);
482 if (signal_pending(current))
483 return -EINTR;
484 spin_lock_irqsave(&priv->dp_port_lock, flags);
485 }
486
487 /* len must be a multiple of 4 and small enough to */
488 /* guarantee the write will send buffered data first, */
489 /* so commands are in order with data and not split */
490 len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
491 if (len > 4)
492 len &= ~3;
493
494 /* write any buffered data first */
495 if (priv->dp_out_buf_len > 0) {
496 data[0] = DIGI_CMD_SEND_DATA;
497 data[1] = priv->dp_out_buf_len;
498 memcpy(data + 2, priv->dp_out_buf,
499 priv->dp_out_buf_len);
500 memcpy(data + 2 + priv->dp_out_buf_len, buf, len);
501 port->write_urb->transfer_buffer_length
502 = priv->dp_out_buf_len + 2 + len;
503 } else {
504 memcpy(data, buf, len);
505 port->write_urb->transfer_buffer_length = len;
506 }
507
508 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
509 if (ret == 0) {
510 priv->dp_write_urb_in_use = 1;
511 priv->dp_out_buf_len = 0;
512 count -= len;
513 buf += len;
514 }
515
516 }
517 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
518
519 if (ret)
520 dev_err(&port->dev,
521 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
522 __func__, ret, priv->dp_port_num);
523 return ret;
524 }
525
526
527 /*
528 * Digi Set Modem Signals
529 *
530 * Sets or clears DTR and RTS on the port, according to the
531 * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags
532 * for the modem_signals argument. Returns 0 if successful,
533 * -EINTR if interrupted while sleeping, or a non-zero error
534 * returned by usb_submit_urb.
535 */
536
537 static int digi_set_modem_signals(struct usb_serial_port *port,
538 unsigned int modem_signals, int interruptible)
539 {
540
541 int ret;
542 struct digi_port *port_priv = usb_get_serial_port_data(port);
543 struct usb_serial_port *oob_port = (struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
544 struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
545 unsigned char *data = oob_port->write_urb->transfer_buffer;
546 unsigned long flags = 0;
547
548
549 dev_dbg(&port->dev,
550 "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x\n",
551 port_priv->dp_port_num, modem_signals);
552
553 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
554 spin_lock(&port_priv->dp_port_lock);
555
556 while (oob_priv->dp_write_urb_in_use) {
557 spin_unlock(&port_priv->dp_port_lock);
558 cond_wait_interruptible_timeout_irqrestore(
559 &oob_port->write_wait, DIGI_RETRY_TIMEOUT,
560 &oob_priv->dp_port_lock, flags);
561 if (interruptible && signal_pending(current))
562 return -EINTR;
563 spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
564 spin_lock(&port_priv->dp_port_lock);
565 }
566 data[0] = DIGI_CMD_SET_DTR_SIGNAL;
567 data[1] = port_priv->dp_port_num;
568 data[2] = (modem_signals & TIOCM_DTR) ?
569 DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
570 data[3] = 0;
571 data[4] = DIGI_CMD_SET_RTS_SIGNAL;
572 data[5] = port_priv->dp_port_num;
573 data[6] = (modem_signals & TIOCM_RTS) ?
574 DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
575 data[7] = 0;
576
577 oob_port->write_urb->transfer_buffer_length = 8;
578
579 ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
580 if (ret == 0) {
581 oob_priv->dp_write_urb_in_use = 1;
582 port_priv->dp_modem_signals =
583 (port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
584 | (modem_signals&(TIOCM_DTR|TIOCM_RTS));
585 }
586 spin_unlock(&port_priv->dp_port_lock);
587 spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
588 if (ret)
589 dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
590 __func__, ret);
591 return ret;
592 }
593
594 /*
595 * Digi Transmit Idle
596 *
597 * Digi transmit idle waits, up to timeout ticks, for the transmitter
598 * to go idle. It returns 0 if successful or a negative error.
599 *
600 * There are race conditions here if more than one process is calling
601 * digi_transmit_idle on the same port at the same time. However, this
602 * is only called from close, and only one process can be in close on a
603 * port at a time, so its ok.
604 */
605
606 static int digi_transmit_idle(struct usb_serial_port *port,
607 unsigned long timeout)
608 {
609 int ret;
610 unsigned char buf[2];
611 struct digi_port *priv = usb_get_serial_port_data(port);
612 unsigned long flags = 0;
613
614 spin_lock_irqsave(&priv->dp_port_lock, flags);
615 priv->dp_transmit_idle = 0;
616 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
617
618 buf[0] = DIGI_CMD_TRANSMIT_IDLE;
619 buf[1] = 0;
620
621 timeout += jiffies;
622
623 ret = digi_write_inb_command(port, buf, 2, timeout - jiffies);
624 if (ret != 0)
625 return ret;
626
627 spin_lock_irqsave(&priv->dp_port_lock, flags);
628
629 while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) {
630 cond_wait_interruptible_timeout_irqrestore(
631 &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
632 &priv->dp_port_lock, flags);
633 if (signal_pending(current))
634 return -EINTR;
635 spin_lock_irqsave(&priv->dp_port_lock, flags);
636 }
637 priv->dp_transmit_idle = 0;
638 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
639 return 0;
640
641 }
642
643
644 static void digi_rx_throttle(struct tty_struct *tty)
645 {
646 unsigned long flags;
647 struct usb_serial_port *port = tty->driver_data;
648 struct digi_port *priv = usb_get_serial_port_data(port);
649
650 /* stop receiving characters by not resubmitting the read urb */
651 spin_lock_irqsave(&priv->dp_port_lock, flags);
652 priv->dp_throttled = 1;
653 priv->dp_throttle_restart = 0;
654 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
655 }
656
657
658 static void digi_rx_unthrottle(struct tty_struct *tty)
659 {
660 int ret = 0;
661 unsigned long flags;
662 struct usb_serial_port *port = tty->driver_data;
663 struct digi_port *priv = usb_get_serial_port_data(port);
664
665 spin_lock_irqsave(&priv->dp_port_lock, flags);
666
667 /* restart read chain */
668 if (priv->dp_throttle_restart)
669 ret = usb_submit_urb(port->read_urb, GFP_ATOMIC);
670
671 /* turn throttle off */
672 priv->dp_throttled = 0;
673 priv->dp_throttle_restart = 0;
674
675 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
676
677 if (ret)
678 dev_err(&port->dev,
679 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
680 __func__, ret, priv->dp_port_num);
681 }
682
683
684 static void digi_set_termios(struct tty_struct *tty,
685 struct usb_serial_port *port, struct ktermios *old_termios)
686 {
687 struct digi_port *priv = usb_get_serial_port_data(port);
688 struct device *dev = &port->dev;
689 unsigned int iflag = tty->termios.c_iflag;
690 unsigned int cflag = tty->termios.c_cflag;
691 unsigned int old_iflag = old_termios->c_iflag;
692 unsigned int old_cflag = old_termios->c_cflag;
693 unsigned char buf[32];
694 unsigned int modem_signals;
695 int arg, ret;
696 int i = 0;
697 speed_t baud;
698
699 dev_dbg(dev,
700 "digi_set_termios: TOP: port=%d, iflag=0x%x, old_iflag=0x%x, cflag=0x%x, old_cflag=0x%x\n",
701 priv->dp_port_num, iflag, old_iflag, cflag, old_cflag);
702
703 /* set baud rate */
704 baud = tty_get_baud_rate(tty);
705 if (baud != tty_termios_baud_rate(old_termios)) {
706 arg = -1;
707
708 /* reassert DTR and (maybe) RTS on transition from B0 */
709 if ((old_cflag&CBAUD) == B0) {
710 /* don't set RTS if using hardware flow control */
711 /* and throttling input */
712 modem_signals = TIOCM_DTR;
713 if (!(tty->termios.c_cflag & CRTSCTS) ||
714 !test_bit(TTY_THROTTLED, &tty->flags))
715 modem_signals |= TIOCM_RTS;
716 digi_set_modem_signals(port, modem_signals, 1);
717 }
718 switch (baud) {
719 /* drop DTR and RTS on transition to B0 */
720 case 0: digi_set_modem_signals(port, 0, 1); break;
721 case 50: arg = DIGI_BAUD_50; break;
722 case 75: arg = DIGI_BAUD_75; break;
723 case 110: arg = DIGI_BAUD_110; break;
724 case 150: arg = DIGI_BAUD_150; break;
725 case 200: arg = DIGI_BAUD_200; break;
726 case 300: arg = DIGI_BAUD_300; break;
727 case 600: arg = DIGI_BAUD_600; break;
728 case 1200: arg = DIGI_BAUD_1200; break;
729 case 1800: arg = DIGI_BAUD_1800; break;
730 case 2400: arg = DIGI_BAUD_2400; break;
731 case 4800: arg = DIGI_BAUD_4800; break;
732 case 9600: arg = DIGI_BAUD_9600; break;
733 case 19200: arg = DIGI_BAUD_19200; break;
734 case 38400: arg = DIGI_BAUD_38400; break;
735 case 57600: arg = DIGI_BAUD_57600; break;
736 case 115200: arg = DIGI_BAUD_115200; break;
737 case 230400: arg = DIGI_BAUD_230400; break;
738 case 460800: arg = DIGI_BAUD_460800; break;
739 default:
740 arg = DIGI_BAUD_9600;
741 baud = 9600;
742 break;
743 }
744 if (arg != -1) {
745 buf[i++] = DIGI_CMD_SET_BAUD_RATE;
746 buf[i++] = priv->dp_port_num;
747 buf[i++] = arg;
748 buf[i++] = 0;
749 }
750 }
751 /* set parity */
752 tty->termios.c_cflag &= ~CMSPAR;
753
754 if ((cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD))) {
755 if (cflag&PARENB) {
756 if (cflag&PARODD)
757 arg = DIGI_PARITY_ODD;
758 else
759 arg = DIGI_PARITY_EVEN;
760 } else {
761 arg = DIGI_PARITY_NONE;
762 }
763 buf[i++] = DIGI_CMD_SET_PARITY;
764 buf[i++] = priv->dp_port_num;
765 buf[i++] = arg;
766 buf[i++] = 0;
767 }
768 /* set word size */
769 if ((cflag&CSIZE) != (old_cflag&CSIZE)) {
770 arg = -1;
771 switch (cflag&CSIZE) {
772 case CS5: arg = DIGI_WORD_SIZE_5; break;
773 case CS6: arg = DIGI_WORD_SIZE_6; break;
774 case CS7: arg = DIGI_WORD_SIZE_7; break;
775 case CS8: arg = DIGI_WORD_SIZE_8; break;
776 default:
777 dev_dbg(dev,
778 "digi_set_termios: can't handle word size %d\n",
779 (cflag&CSIZE));
780 break;
781 }
782
783 if (arg != -1) {
784 buf[i++] = DIGI_CMD_SET_WORD_SIZE;
785 buf[i++] = priv->dp_port_num;
786 buf[i++] = arg;
787 buf[i++] = 0;
788 }
789
790 }
791
792 /* set stop bits */
793 if ((cflag&CSTOPB) != (old_cflag&CSTOPB)) {
794
795 if ((cflag&CSTOPB))
796 arg = DIGI_STOP_BITS_2;
797 else
798 arg = DIGI_STOP_BITS_1;
799
800 buf[i++] = DIGI_CMD_SET_STOP_BITS;
801 buf[i++] = priv->dp_port_num;
802 buf[i++] = arg;
803 buf[i++] = 0;
804
805 }
806
807 /* set input flow control */
808 if ((iflag&IXOFF) != (old_iflag&IXOFF)
809 || (cflag&CRTSCTS) != (old_cflag&CRTSCTS)) {
810 arg = 0;
811 if (iflag&IXOFF)
812 arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
813 else
814 arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
815
816 if (cflag&CRTSCTS) {
817 arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
818
819 /* On USB-4 it is necessary to assert RTS prior */
820 /* to selecting RTS input flow control. */
821 buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
822 buf[i++] = priv->dp_port_num;
823 buf[i++] = DIGI_RTS_ACTIVE;
824 buf[i++] = 0;
825
826 } else {
827 arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
828 }
829 buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
830 buf[i++] = priv->dp_port_num;
831 buf[i++] = arg;
832 buf[i++] = 0;
833 }
834
835 /* set output flow control */
836 if ((iflag & IXON) != (old_iflag & IXON)
837 || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
838 arg = 0;
839 if (iflag & IXON)
840 arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
841 else
842 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
843
844 if (cflag & CRTSCTS) {
845 arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
846 } else {
847 arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
848 tty->hw_stopped = 0;
849 }
850
851 buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
852 buf[i++] = priv->dp_port_num;
853 buf[i++] = arg;
854 buf[i++] = 0;
855 }
856
857 /* set receive enable/disable */
858 if ((cflag & CREAD) != (old_cflag & CREAD)) {
859 if (cflag & CREAD)
860 arg = DIGI_ENABLE;
861 else
862 arg = DIGI_DISABLE;
863
864 buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
865 buf[i++] = priv->dp_port_num;
866 buf[i++] = arg;
867 buf[i++] = 0;
868 }
869 ret = digi_write_oob_command(port, buf, i, 1);
870 if (ret != 0)
871 dev_dbg(dev, "digi_set_termios: write oob failed, ret=%d\n", ret);
872 tty_encode_baud_rate(tty, baud, baud);
873 }
874
875
876 static void digi_break_ctl(struct tty_struct *tty, int break_state)
877 {
878 struct usb_serial_port *port = tty->driver_data;
879 unsigned char buf[4];
880
881 buf[0] = DIGI_CMD_BREAK_CONTROL;
882 buf[1] = 2; /* length */
883 buf[2] = break_state ? 1 : 0;
884 buf[3] = 0; /* pad */
885 digi_write_inb_command(port, buf, 4, 0);
886 }
887
888
889 static int digi_tiocmget(struct tty_struct *tty)
890 {
891 struct usb_serial_port *port = tty->driver_data;
892 struct digi_port *priv = usb_get_serial_port_data(port);
893 unsigned int val;
894 unsigned long flags;
895
896 spin_lock_irqsave(&priv->dp_port_lock, flags);
897 val = priv->dp_modem_signals;
898 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
899 return val;
900 }
901
902
903 static int digi_tiocmset(struct tty_struct *tty,
904 unsigned int set, unsigned int clear)
905 {
906 struct usb_serial_port *port = tty->driver_data;
907 struct digi_port *priv = usb_get_serial_port_data(port);
908 unsigned int val;
909 unsigned long flags;
910
911 spin_lock_irqsave(&priv->dp_port_lock, flags);
912 val = (priv->dp_modem_signals & ~clear) | set;
913 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
914 return digi_set_modem_signals(port, val, 1);
915 }
916
917
918 static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
919 const unsigned char *buf, int count)
920 {
921
922 int ret, data_len, new_len;
923 struct digi_port *priv = usb_get_serial_port_data(port);
924 unsigned char *data = port->write_urb->transfer_buffer;
925 unsigned long flags = 0;
926
927 dev_dbg(&port->dev,
928 "digi_write: TOP: port=%d, count=%d, in_interrupt=%ld\n",
929 priv->dp_port_num, count, in_interrupt());
930
931 /* copy user data (which can sleep) before getting spin lock */
932 count = min(count, port->bulk_out_size-2);
933 count = min(64, count);
934
935 /* be sure only one write proceeds at a time */
936 /* there are races on the port private buffer */
937 spin_lock_irqsave(&priv->dp_port_lock, flags);
938
939 /* wait for urb status clear to submit another urb */
940 if (priv->dp_write_urb_in_use) {
941 /* buffer data if count is 1 (probably put_char) if possible */
942 if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) {
943 priv->dp_out_buf[priv->dp_out_buf_len++] = *buf;
944 new_len = 1;
945 } else {
946 new_len = 0;
947 }
948 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
949 return new_len;
950 }
951
952 /* allow space for any buffered data and for new data, up to */
953 /* transfer buffer size - 2 (for command and length bytes) */
954 new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
955 data_len = new_len + priv->dp_out_buf_len;
956
957 if (data_len == 0) {
958 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
959 return 0;
960 }
961
962 port->write_urb->transfer_buffer_length = data_len+2;
963
964 *data++ = DIGI_CMD_SEND_DATA;
965 *data++ = data_len;
966
967 /* copy in buffered data first */
968 memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len);
969 data += priv->dp_out_buf_len;
970
971 /* copy in new data */
972 memcpy(data, buf, new_len);
973
974 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
975 if (ret == 0) {
976 priv->dp_write_urb_in_use = 1;
977 ret = new_len;
978 priv->dp_out_buf_len = 0;
979 }
980
981 /* return length of new data written, or error */
982 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
983 if (ret < 0)
984 dev_err_console(port,
985 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
986 __func__, ret, priv->dp_port_num);
987 dev_dbg(&port->dev, "digi_write: returning %d\n", ret);
988 return ret;
989
990 }
991
992 static void digi_write_bulk_callback(struct urb *urb)
993 {
994
995 struct usb_serial_port *port = urb->context;
996 struct usb_serial *serial;
997 struct digi_port *priv;
998 struct digi_serial *serial_priv;
999 int ret = 0;
1000 int status = urb->status;
1001
1002 /* port and serial sanity check */
1003 if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) {
1004 pr_err("%s: port or port->private is NULL, status=%d\n",
1005 __func__, status);
1006 return;
1007 }
1008 serial = port->serial;
1009 if (serial == NULL || (serial_priv = usb_get_serial_data(serial)) == NULL) {
1010 dev_err(&port->dev,
1011 "%s: serial or serial->private is NULL, status=%d\n",
1012 __func__, status);
1013 return;
1014 }
1015
1016 /* handle oob callback */
1017 if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1018 dev_dbg(&port->dev, "digi_write_bulk_callback: oob callback\n");
1019 spin_lock(&priv->dp_port_lock);
1020 priv->dp_write_urb_in_use = 0;
1021 wake_up_interruptible(&port->write_wait);
1022 spin_unlock(&priv->dp_port_lock);
1023 return;
1024 }
1025
1026 /* try to send any buffered data on this port */
1027 spin_lock(&priv->dp_port_lock);
1028 priv->dp_write_urb_in_use = 0;
1029 if (priv->dp_out_buf_len > 0) {
1030 *((unsigned char *)(port->write_urb->transfer_buffer))
1031 = (unsigned char)DIGI_CMD_SEND_DATA;
1032 *((unsigned char *)(port->write_urb->transfer_buffer) + 1)
1033 = (unsigned char)priv->dp_out_buf_len;
1034 port->write_urb->transfer_buffer_length =
1035 priv->dp_out_buf_len + 2;
1036 memcpy(port->write_urb->transfer_buffer + 2, priv->dp_out_buf,
1037 priv->dp_out_buf_len);
1038 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1039 if (ret == 0) {
1040 priv->dp_write_urb_in_use = 1;
1041 priv->dp_out_buf_len = 0;
1042 }
1043 }
1044 /* wake up processes sleeping on writes immediately */
1045 digi_wakeup_write(port);
1046 /* also queue up a wakeup at scheduler time, in case we */
1047 /* lost the race in write_chan(). */
1048 schedule_work(&priv->dp_wakeup_work);
1049
1050 spin_unlock(&priv->dp_port_lock);
1051 if (ret && ret != -EPERM)
1052 dev_err_console(port,
1053 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1054 __func__, ret, priv->dp_port_num);
1055 }
1056
1057 static int digi_write_room(struct tty_struct *tty)
1058 {
1059 struct usb_serial_port *port = tty->driver_data;
1060 struct digi_port *priv = usb_get_serial_port_data(port);
1061 int room;
1062 unsigned long flags = 0;
1063
1064 spin_lock_irqsave(&priv->dp_port_lock, flags);
1065
1066 if (priv->dp_write_urb_in_use)
1067 room = 0;
1068 else
1069 room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
1070
1071 spin_unlock_irqrestore(&priv->dp_port_lock, flags);
1072 dev_dbg(&port->dev, "digi_write_room: port=%d, room=%d\n", priv->dp_port_num, room);
1073 return room;
1074
1075 }
1076
1077 static int digi_chars_in_buffer(struct tty_struct *tty)
1078 {
1079 struct usb_serial_port *port = tty->driver_data;
1080 struct digi_port *priv = usb_get_serial_port_data(port);
1081
1082 if (priv->dp_write_urb_in_use) {
1083 dev_dbg(&port->dev, "digi_chars_in_buffer: port=%d, chars=%d\n",
1084 priv->dp_port_num, port->bulk_out_size - 2);
1085 /* return(port->bulk_out_size - 2); */
1086 return 256;
1087 } else {
1088 dev_dbg(&port->dev, "digi_chars_in_buffer: port=%d, chars=%d\n",
1089 priv->dp_port_num, priv->dp_out_buf_len);
1090 return priv->dp_out_buf_len;
1091 }
1092
1093 }
1094
1095 static void digi_dtr_rts(struct usb_serial_port *port, int on)
1096 {
1097 /* Adjust DTR and RTS */
1098 digi_set_modem_signals(port, on * (TIOCM_DTR|TIOCM_RTS), 1);
1099 }
1100
1101 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port)
1102 {
1103 int ret;
1104 unsigned char buf[32];
1105 struct digi_port *priv = usb_get_serial_port_data(port);
1106 struct ktermios not_termios;
1107
1108 /* be sure the device is started up */
1109 if (digi_startup_device(port->serial) != 0)
1110 return -ENXIO;
1111
1112 /* read modem signals automatically whenever they change */
1113 buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
1114 buf[1] = priv->dp_port_num;
1115 buf[2] = DIGI_ENABLE;
1116 buf[3] = 0;
1117
1118 /* flush fifos */
1119 buf[4] = DIGI_CMD_IFLUSH_FIFO;
1120 buf[5] = priv->dp_port_num;
1121 buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1122 buf[7] = 0;
1123
1124 ret = digi_write_oob_command(port, buf, 8, 1);
1125 if (ret != 0)
1126 dev_dbg(&port->dev, "digi_open: write oob failed, ret=%d\n", ret);
1127
1128 /* set termios settings */
1129 if (tty) {
1130 not_termios.c_cflag = ~tty->termios.c_cflag;
1131 not_termios.c_iflag = ~tty->termios.c_iflag;
1132 digi_set_termios(tty, port, &not_termios);
1133 }
1134 return 0;
1135 }
1136
1137
1138 static void digi_close(struct usb_serial_port *port)
1139 {
1140 DEFINE_WAIT(wait);
1141 int ret;
1142 unsigned char buf[32];
1143 struct digi_port *priv = usb_get_serial_port_data(port);
1144
1145 mutex_lock(&port->serial->disc_mutex);
1146 /* if disconnected, just clear flags */
1147 if (port->serial->disconnected)
1148 goto exit;
1149
1150 if (port->serial->dev) {
1151 /* FIXME: Transmit idle belongs in the wait_unti_sent path */
1152 digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT);
1153
1154 /* disable input flow control */
1155 buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
1156 buf[1] = priv->dp_port_num;
1157 buf[2] = DIGI_DISABLE;
1158 buf[3] = 0;
1159
1160 /* disable output flow control */
1161 buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
1162 buf[5] = priv->dp_port_num;
1163 buf[6] = DIGI_DISABLE;
1164 buf[7] = 0;
1165
1166 /* disable reading modem signals automatically */
1167 buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
1168 buf[9] = priv->dp_port_num;
1169 buf[10] = DIGI_DISABLE;
1170 buf[11] = 0;
1171
1172 /* disable receive */
1173 buf[12] = DIGI_CMD_RECEIVE_ENABLE;
1174 buf[13] = priv->dp_port_num;
1175 buf[14] = DIGI_DISABLE;
1176 buf[15] = 0;
1177
1178 /* flush fifos */
1179 buf[16] = DIGI_CMD_IFLUSH_FIFO;
1180 buf[17] = priv->dp_port_num;
1181 buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
1182 buf[19] = 0;
1183
1184 ret = digi_write_oob_command(port, buf, 20, 0);
1185 if (ret != 0)
1186 dev_dbg(&port->dev, "digi_close: write oob failed, ret=%d\n", ret);
1187
1188 /* wait for final commands on oob port to complete */
1189 prepare_to_wait(&priv->dp_flush_wait, &wait,
1190 TASK_INTERRUPTIBLE);
1191 schedule_timeout(DIGI_CLOSE_TIMEOUT);
1192 finish_wait(&priv->dp_flush_wait, &wait);
1193
1194 /* shutdown any outstanding bulk writes */
1195 usb_kill_urb(port->write_urb);
1196 }
1197 exit:
1198 spin_lock_irq(&priv->dp_port_lock);
1199 priv->dp_write_urb_in_use = 0;
1200 wake_up_interruptible(&priv->dp_close_wait);
1201 spin_unlock_irq(&priv->dp_port_lock);
1202 mutex_unlock(&port->serial->disc_mutex);
1203 }
1204
1205
1206 /*
1207 * Digi Startup Device
1208 *
1209 * Starts reads on all ports. Must be called AFTER startup, with
1210 * urbs initialized. Returns 0 if successful, non-zero error otherwise.
1211 */
1212
1213 static int digi_startup_device(struct usb_serial *serial)
1214 {
1215 int i, ret = 0;
1216 struct digi_serial *serial_priv = usb_get_serial_data(serial);
1217 struct usb_serial_port *port;
1218
1219 /* be sure this happens exactly once */
1220 spin_lock(&serial_priv->ds_serial_lock);
1221 if (serial_priv->ds_device_started) {
1222 spin_unlock(&serial_priv->ds_serial_lock);
1223 return 0;
1224 }
1225 serial_priv->ds_device_started = 1;
1226 spin_unlock(&serial_priv->ds_serial_lock);
1227
1228 /* start reading from each bulk in endpoint for the device */
1229 /* set USB_DISABLE_SPD flag for write bulk urbs */
1230 for (i = 0; i < serial->type->num_ports + 1; i++) {
1231 port = serial->port[i];
1232 ret = usb_submit_urb(port->read_urb, GFP_KERNEL);
1233 if (ret != 0) {
1234 dev_err(&port->dev,
1235 "%s: usb_submit_urb failed, ret=%d, port=%d\n",
1236 __func__, ret, i);
1237 break;
1238 }
1239 }
1240 return ret;
1241 }
1242
1243
1244 static int digi_startup(struct usb_serial *serial)
1245 {
1246
1247 int i;
1248 struct digi_port *priv;
1249 struct digi_serial *serial_priv;
1250
1251 /* allocate the private data structures for all ports */
1252 /* number of regular ports + 1 for the out-of-band port */
1253 for (i = 0; i < serial->type->num_ports + 1; i++) {
1254 /* allocate port private structure */
1255 priv = kmalloc(sizeof(struct digi_port), GFP_KERNEL);
1256 if (priv == NULL) {
1257 while (--i >= 0)
1258 kfree(usb_get_serial_port_data(serial->port[i]));
1259 return 1; /* error */
1260 }
1261
1262 /* initialize port private structure */
1263 spin_lock_init(&priv->dp_port_lock);
1264 priv->dp_port_num = i;
1265 priv->dp_out_buf_len = 0;
1266 priv->dp_write_urb_in_use = 0;
1267 priv->dp_modem_signals = 0;
1268 init_waitqueue_head(&priv->dp_modem_change_wait);
1269 priv->dp_transmit_idle = 0;
1270 init_waitqueue_head(&priv->dp_transmit_idle_wait);
1271 priv->dp_throttled = 0;
1272 priv->dp_throttle_restart = 0;
1273 init_waitqueue_head(&priv->dp_flush_wait);
1274 init_waitqueue_head(&priv->dp_close_wait);
1275 INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock);
1276 priv->dp_port = serial->port[i];
1277 /* initialize write wait queue for this port */
1278 init_waitqueue_head(&serial->port[i]->write_wait);
1279
1280 usb_set_serial_port_data(serial->port[i], priv);
1281 }
1282
1283 /* allocate serial private structure */
1284 serial_priv = kmalloc(sizeof(struct digi_serial), GFP_KERNEL);
1285 if (serial_priv == NULL) {
1286 for (i = 0; i < serial->type->num_ports + 1; i++)
1287 kfree(usb_get_serial_port_data(serial->port[i]));
1288 return 1; /* error */
1289 }
1290
1291 /* initialize serial private structure */
1292 spin_lock_init(&serial_priv->ds_serial_lock);
1293 serial_priv->ds_oob_port_num = serial->type->num_ports;
1294 serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
1295 serial_priv->ds_device_started = 0;
1296 usb_set_serial_data(serial, serial_priv);
1297
1298 return 0;
1299 }
1300
1301
1302 static void digi_disconnect(struct usb_serial *serial)
1303 {
1304 int i;
1305
1306 /* stop reads and writes on all ports */
1307 for (i = 0; i < serial->type->num_ports + 1; i++) {
1308 usb_kill_urb(serial->port[i]->read_urb);
1309 usb_kill_urb(serial->port[i]->write_urb);
1310 }
1311 }
1312
1313
1314 static void digi_release(struct usb_serial *serial)
1315 {
1316 int i;
1317
1318 /* free the private data structures for all ports */
1319 /* number of regular ports + 1 for the out-of-band port */
1320 for (i = 0; i < serial->type->num_ports + 1; i++)
1321 kfree(usb_get_serial_port_data(serial->port[i]));
1322 kfree(usb_get_serial_data(serial));
1323 }
1324
1325
1326 static void digi_read_bulk_callback(struct urb *urb)
1327 {
1328 struct usb_serial_port *port = urb->context;
1329 struct digi_port *priv;
1330 struct digi_serial *serial_priv;
1331 int ret;
1332 int status = urb->status;
1333
1334 /* port sanity check, do not resubmit if port is not valid */
1335 if (port == NULL)
1336 return;
1337 priv = usb_get_serial_port_data(port);
1338 if (priv == NULL) {
1339 dev_err(&port->dev, "%s: port->private is NULL, status=%d\n",
1340 __func__, status);
1341 return;
1342 }
1343 if (port->serial == NULL ||
1344 (serial_priv = usb_get_serial_data(port->serial)) == NULL) {
1345 dev_err(&port->dev, "%s: serial is bad or serial->private "
1346 "is NULL, status=%d\n", __func__, status);
1347 return;
1348 }
1349
1350 /* do not resubmit urb if it has any status error */
1351 if (status) {
1352 dev_err(&port->dev,
1353 "%s: nonzero read bulk status: status=%d, port=%d\n",
1354 __func__, status, priv->dp_port_num);
1355 return;
1356 }
1357
1358 /* handle oob or inb callback, do not resubmit if error */
1359 if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
1360 if (digi_read_oob_callback(urb) != 0)
1361 return;
1362 } else {
1363 if (digi_read_inb_callback(urb) != 0)
1364 return;
1365 }
1366
1367 /* continue read */
1368 ret = usb_submit_urb(urb, GFP_ATOMIC);
1369 if (ret != 0 && ret != -EPERM) {
1370 dev_err(&port->dev,
1371 "%s: failed resubmitting urb, ret=%d, port=%d\n",
1372 __func__, ret, priv->dp_port_num);
1373 }
1374
1375 }
1376
1377 /*
1378 * Digi Read INB Callback
1379 *
1380 * Digi Read INB Callback handles reads on the in band ports, sending
1381 * the data on to the tty subsystem. When called we know port and
1382 * port->private are not NULL and port->serial has been validated.
1383 * It returns 0 if successful, 1 if successful but the port is
1384 * throttled, and -1 if the sanity checks failed.
1385 */
1386
1387 static int digi_read_inb_callback(struct urb *urb)
1388 {
1389
1390 struct usb_serial_port *port = urb->context;
1391 struct tty_struct *tty;
1392 struct digi_port *priv = usb_get_serial_port_data(port);
1393 int opcode = ((unsigned char *)urb->transfer_buffer)[0];
1394 int len = ((unsigned char *)urb->transfer_buffer)[1];
1395 int port_status = ((unsigned char *)urb->transfer_buffer)[2];
1396 unsigned char *data = ((unsigned char *)urb->transfer_buffer) + 3;
1397 int flag, throttled;
1398 int status = urb->status;
1399
1400 /* do not process callbacks on closed ports */
1401 /* but do continue the read chain */
1402 if (urb->status == -ENOENT)
1403 return 0;
1404
1405 /* short/multiple packet check */
1406 if (urb->actual_length != len + 2) {
1407 dev_err(&port->dev, "%s: INCOMPLETE OR MULTIPLE PACKET, "
1408 "status=%d, port=%d, opcode=%d, len=%d, "
1409 "actual_length=%d, status=%d\n", __func__, status,
1410 priv->dp_port_num, opcode, len, urb->actual_length,
1411 port_status);
1412 return -1;
1413 }
1414
1415 tty = tty_port_tty_get(&port->port);
1416 spin_lock(&priv->dp_port_lock);
1417
1418 /* check for throttle; if set, do not resubmit read urb */
1419 /* indicate the read chain needs to be restarted on unthrottle */
1420 throttled = priv->dp_throttled;
1421 if (throttled)
1422 priv->dp_throttle_restart = 1;
1423
1424 /* receive data */
1425 if (tty && opcode == DIGI_CMD_RECEIVE_DATA) {
1426 /* get flag from port_status */
1427 flag = 0;
1428
1429 /* overrun is special, not associated with a char */
1430 if (port_status & DIGI_OVERRUN_ERROR)
1431 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
1432
1433 /* break takes precedence over parity, */
1434 /* which takes precedence over framing errors */
1435 if (port_status & DIGI_BREAK_ERROR)
1436 flag = TTY_BREAK;
1437 else if (port_status & DIGI_PARITY_ERROR)
1438 flag = TTY_PARITY;
1439 else if (port_status & DIGI_FRAMING_ERROR)
1440 flag = TTY_FRAME;
1441
1442 /* data length is len-1 (one byte of len is port_status) */
1443 --len;
1444 if (len > 0) {
1445 tty_insert_flip_string_fixed_flag(tty, data, flag,
1446 len);
1447 tty_flip_buffer_push(tty);
1448 }
1449 }
1450 spin_unlock(&priv->dp_port_lock);
1451 tty_kref_put(tty);
1452
1453 if (opcode == DIGI_CMD_RECEIVE_DISABLE)
1454 dev_dbg(&port->dev, "%s: got RECEIVE_DISABLE\n", __func__);
1455 else if (opcode != DIGI_CMD_RECEIVE_DATA)
1456 dev_dbg(&port->dev, "%s: unknown opcode: %d\n", __func__, opcode);
1457
1458 return throttled ? 1 : 0;
1459
1460 }
1461
1462
1463 /*
1464 * Digi Read OOB Callback
1465 *
1466 * Digi Read OOB Callback handles reads on the out of band port.
1467 * When called we know port and port->private are not NULL and
1468 * the port->serial is valid. It returns 0 if successful, and
1469 * -1 if the sanity checks failed.
1470 */
1471
1472 static int digi_read_oob_callback(struct urb *urb)
1473 {
1474
1475 struct usb_serial_port *port = urb->context;
1476 struct usb_serial *serial = port->serial;
1477 struct tty_struct *tty;
1478 struct digi_port *priv = usb_get_serial_port_data(port);
1479 int opcode, line, status, val;
1480 int i;
1481 unsigned int rts;
1482
1483 /* handle each oob command */
1484 for (i = 0; i < urb->actual_length - 3;) {
1485 opcode = ((unsigned char *)urb->transfer_buffer)[i++];
1486 line = ((unsigned char *)urb->transfer_buffer)[i++];
1487 status = ((unsigned char *)urb->transfer_buffer)[i++];
1488 val = ((unsigned char *)urb->transfer_buffer)[i++];
1489
1490 dev_dbg(&port->dev, "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d\n",
1491 opcode, line, status, val);
1492
1493 if (status != 0 || line >= serial->type->num_ports)
1494 continue;
1495
1496 port = serial->port[line];
1497
1498 priv = usb_get_serial_port_data(port);
1499 if (priv == NULL)
1500 return -1;
1501
1502 tty = tty_port_tty_get(&port->port);
1503
1504 rts = 0;
1505 if (tty)
1506 rts = tty->termios.c_cflag & CRTSCTS;
1507
1508 if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
1509 spin_lock(&priv->dp_port_lock);
1510 /* convert from digi flags to termiox flags */
1511 if (val & DIGI_READ_INPUT_SIGNALS_CTS) {
1512 priv->dp_modem_signals |= TIOCM_CTS;
1513 /* port must be open to use tty struct */
1514 if (rts) {
1515 tty->hw_stopped = 0;
1516 digi_wakeup_write(port);
1517 }
1518 } else {
1519 priv->dp_modem_signals &= ~TIOCM_CTS;
1520 /* port must be open to use tty struct */
1521 if (rts)
1522 tty->hw_stopped = 1;
1523 }
1524 if (val & DIGI_READ_INPUT_SIGNALS_DSR)
1525 priv->dp_modem_signals |= TIOCM_DSR;
1526 else
1527 priv->dp_modem_signals &= ~TIOCM_DSR;
1528 if (val & DIGI_READ_INPUT_SIGNALS_RI)
1529 priv->dp_modem_signals |= TIOCM_RI;
1530 else
1531 priv->dp_modem_signals &= ~TIOCM_RI;
1532 if (val & DIGI_READ_INPUT_SIGNALS_DCD)
1533 priv->dp_modem_signals |= TIOCM_CD;
1534 else
1535 priv->dp_modem_signals &= ~TIOCM_CD;
1536
1537 wake_up_interruptible(&priv->dp_modem_change_wait);
1538 spin_unlock(&priv->dp_port_lock);
1539 } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) {
1540 spin_lock(&priv->dp_port_lock);
1541 priv->dp_transmit_idle = 1;
1542 wake_up_interruptible(&priv->dp_transmit_idle_wait);
1543 spin_unlock(&priv->dp_port_lock);
1544 } else if (opcode == DIGI_CMD_IFLUSH_FIFO) {
1545 wake_up_interruptible(&priv->dp_flush_wait);
1546 }
1547 tty_kref_put(tty);
1548 }
1549 return 0;
1550
1551 }
1552
1553 module_usb_serial_driver(serial_drivers, id_table_combined);
1554
1555 MODULE_AUTHOR(DRIVER_AUTHOR);
1556 MODULE_DESCRIPTION(DRIVER_DESC);
1557 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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